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is a significant concern for physicians. Central; ?$ @/ ~2 h- p, J8 A& h$ r
precocious puberty (CPP), which is mediated- J2 n9 X/ f" q2 W1 _
through the hypothalamic pituitary gonadal axis, has' s: d& i4 V) L
a higher incidence of organic central nervous system
4 g5 }- J% @8 E/ X$ e* L' Jlesions in boys.1,2 Virilization in boys, as manifested
% x0 G( {. Q7 z+ Eby enlargement of the penis, development of pubic1 `7 z( j( r U" Q8 l8 B: v
hair, and facial acne without enlargement of testi-5 d0 P5 \" I0 S* y% `# C
cles, suggests peripheral or pseudopuberty.1-3 We/ E* {4 Z5 q# ]8 w. x
report a 16-month-old boy who presented with the
! |9 g t/ f( O6 N% j7 z0 eenlargement of the phallus and pubic hair develop-4 U6 `+ L+ u( g5 H
ment without testicular enlargement, which was due
, ]5 Q2 L8 e: j1 G! `9 B9 v7 jto the unintentional exposure to androgen gel used by
# R* x% O: w) F# kthe father. The family initially concealed this infor-
$ ^5 @4 Z, K# U5 B+ g! wmation, resulting in an extensive work-up for this7 C( q' [/ P# M
child. Given the widespread and easy availability of3 U. m% X# N2 l. y- Q8 ^
testosterone gel and cream, we believe this is proba-
! M- \2 ?4 m @bly more common than the rare case report in the U% f+ X+ F q J8 c
literature.4/ V2 O8 z/ h& |
Patient Report
* i! l/ a$ }; |A 16-month-old white child was referred to the
% s/ d$ v0 M8 o6 t* Gendocrine clinic by his pediatrician with the concern n# c* U# ?2 E/ U
of early sexual development. His mother noticed( a; Y! U$ j& _, D" N
light colored pubic hair development when he was
+ h* M- }( n; `" _) Z6 qFrom the 1Division of Pediatric Endocrinology, 2University of% u7 T5 i" S$ ^7 P: V8 q$ j
South Alabama Medical Center, Mobile, Alabama.. u" A5 ~' c) z; W6 _6 g
Address correspondence to: Samar K. Bhowmick, MD, FACE,
0 F) ]5 A& l4 xProfessor of Pediatrics, University of South Alabama, College of
' Y2 X* A0 W7 YMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;) x, ]1 M2 d8 [+ n1 V
e-mail: [email protected].# c4 K) `; q# @3 ?3 Y$ Z9 M8 M
about 6 to 7 months old, which progressively became2 H$ l8 o! C8 s+ }+ O V
darker. She was also concerned about the enlarge-5 m7 }' d" o( d, b
ment of his penis and frequent erections. The child) G4 C" c( x$ N- C) @1 b
was the product of a full-term normal delivery, with; p4 v: D4 ~$ l9 `4 p& n) ]! e
a birth weight of 7 lb 14 oz, and birth length of
$ @* ]& w0 {, K0 {3 F6 Y20 inches. He was breast-fed throughout the first year
/ Z; g1 K6 T. f) \of life and was still receiving breast milk along with H. G+ e# k1 K6 ^; N3 M% K
solid food. He had no hospitalizations or surgery,: g4 B# B, ]% h. i7 h' E1 e! ?: c
and his psychosocial and psychomotor development" I, ~+ s0 |& ]. F
was age appropriate./ i8 B9 D' _$ p6 g. N" y
The family history was remarkable for the father,0 d0 R6 p4 P$ E1 ?+ J
who was diagnosed with hypothyroidism at age 16,' D5 g' n h2 E5 k
which was treated with thyroxine. The father’s
5 b. k1 F$ G- Y8 K0 t* E0 kheight was 6 feet, and he went through a somewhat
6 u3 K8 m K5 l. b: rearly puberty and had stopped growing by age 14.) ^; {* g- M% e, V( k
The father denied taking any other medication. The! g5 X; [" Y# v( G; X0 S* a
child’s mother was in good health. Her menarche
: L! l( [7 X3 awas at 11 years of age, and her height was at 5 feet
8 w4 m/ }2 C) m% K5 inches. There was no other family history of pre-" A h" D/ p* g1 [. Y2 @0 h
cocious sexual development in the first-degree rela-
* l, ]( D9 E+ m. Stives. There were no siblings.
, _% u( [# ]7 B7 ?# tPhysical Examination. T k C. ^, F W
The physical examination revealed a very active,' I3 T/ h, ~6 x
playful, and healthy boy. The vital signs documented, J9 g( [1 N6 C, |( F
a blood pressure of 85/50 mm Hg, his length was
3 l* R8 U$ A4 j% `+ V90 cm (>97th percentile), and his weight was 14.4 kg
! L9 t3 }5 ]- w- X( O& Q* b(also >97th percentile). The observed yearly growth
9 W- N- T, P j& ]velocity was 30 cm (12 inches). The examination of
8 t; A; Q) \* lthe neck revealed no thyroid enlargement.
" x/ u4 @9 [4 u4 m0 sThe genitourinary examination was remarkable for; k5 e; z" k/ ^& {& U/ Q3 |
enlargement of the penis, with a stretched length of) B) l2 }; r1 q) _8 u6 N& q
8 cm and a width of 2 cm. The glans penis was very well
% Y c: }' [: D! I7 r" Vdeveloped. The pubic hair was Tanner II, mostly around2 J( A8 z' x S* Z. ]) ]
5401 e8 L) B3 T. q
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
6 T& k p& F4 t& hthe base of the phallus and was dark and curled. The8 f# S# a2 L2 H$ ^
testicular volume was prepubertal at 2 mL each.
6 \: w( t6 \9 [8 v$ {6 A6 WThe skin was moist and smooth and somewhat
4 h- E) ^+ {2 k# moily. No axillary hair was noted. There were no. \8 ], K: L/ A9 G# ~ u# I! Z$ T
abnormal skin pigmentations or café-au-lait spots.. ]. A1 S% U( _& g+ C
Neurologic evaluation showed deep tendon reflex 2+
; Z' G; l1 P* r% R& \' P, [bilateral and symmetrical. There was no suggestion f; l4 q7 o7 @0 I1 X& H/ h* \
of papilledema.
/ n) t# d& s. u. }; ]0 P3 LLaboratory Evaluation3 Q- V5 ~' C7 |. a9 P1 u
The bone age was consistent with 28 months by2 J; M1 D" {. E$ w! B6 p
using the standard of Greulich and Pyle at a chrono-3 b2 y# c: e2 ~1 S
logic age of 16 months (advanced).5 Chromosomal
. o- d8 I$ G9 X+ @karyotype was 46XY. The thyroid function test
2 N9 K$ ?0 X) N$ X# C+ T2 a/ ^showed a free T4 of 1.69 ng/dL, and thyroid stimu-3 J5 R; A: s- B) P
lating hormone level was 1.3 µIU/mL (both normal).
& \1 [6 @. Y8 g' U) w- ]The concentrations of serum electrolytes, blood' ]/ w: R& i9 M8 Z) M" I
urea nitrogen, creatinine, and calcium all were
1 `+ U d* b- V0 a) ]within normal range for his age. The concentration
v) ^$ g% U1 N: I; Y% Zof serum 17-hydroxyprogesterone was 16 ng/dL4 X2 O- r0 o$ F8 M/ \) V
(normal, 3 to 90 ng/dL), androstenedione was 20
# W! j5 L; H+ N, e y# Nng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-' V% @& Y" C- o; X$ K$ K
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
' {! x$ P# U3 D+ U; \" H, [desoxycorticosterone was 4.3 ng/dL (normal, 7 to
1 E0 e$ {5 Q5 r* m( }49ng/dL), 11-desoxycortisol (specific compound S)- f/ @! `' `( ] U! N
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
3 c' G3 f) e0 z& O- Stisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
. y$ R. }$ w `/ _* Ktestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
+ f" r4 U" o" r, m" @; S6 m Jand β-human chorionic gonadotropin was less than# I3 p$ `; D3 t; Y. G! v2 Z. e* f
5 mIU/mL (normal <5 mIU/mL). Serum follicular3 E3 M% t: K: [$ y8 B5 g2 ?
stimulating hormone and leuteinizing hormone
, t$ X8 H+ f. x( J' q, vconcentrations were less than 0.05 mIU/mL
Z! O3 Y/ A2 c# T R& [(prepubertal).
8 u) _. ~8 J3 U. E. s- GThe parents were notified about the laboratory8 r" e( N+ b6 D$ S' l, q
results and were informed that all of the tests were
9 C4 u# \7 o* z b) S) t6 Snormal except the testosterone level was high. The
5 r9 a$ C8 [9 q# j" Q8 L$ Afollow-up visit was arranged within a few weeks to+ O& X" L3 |3 b! Q0 l
obtain testicular and abdominal sonograms; how-
+ d/ {7 }+ ]( h( j7 M7 Cever, the family did not return for 4 months.
$ E, }8 i* @" @1 C9 ]$ ^, {Physical examination at this time revealed that the
" C0 s, g7 l% @child had grown 2.5 cm in 4 months and had gained8 A. q R4 @) Q* q" d4 d3 F
2 kg of weight. Physical examination remained: e+ O# W- J* Q, f' t: Z3 p
unchanged. Surprisingly, the pubic hair almost com-
0 m; C$ E# `! ]9 v9 Bpletely disappeared except for a few vellous hairs at+ U+ ]% F: w' r2 H- J
the base of the phallus. Testicular volume was still 28 v' O1 m% O8 C0 h, ?5 ]9 t6 K
mL, and the size of the penis remained unchanged." Z U; r* U; A( q6 X
The mother also said that the boy was no longer hav-2 @9 j- `+ R! l% t9 q' ^( H; j
ing frequent erections.
2 ~! v/ B1 u3 V, h% k" A" ~" g7 gBoth parents were again questioned about use of' ~" |' k9 y- ]( X- m+ q% _
any ointment/creams that they may have applied to- w0 @' w0 c/ {' y& A. w. ^/ d/ n
the child’s skin. This time the father admitted the+ F; N- R2 {+ f; l
Topical Testosterone Exposure / Bhowmick et al 541
0 {! C8 D; G% y, Nuse of testosterone gel twice daily that he was apply-5 ?) C5 K4 R4 @9 G
ing over his own shoulders, chest, and back area for
6 F2 r4 `9 D. v; n; `) g5 d. A5 wa year. The father also revealed he was embarrassed
* J8 Q0 t9 x" e; B5 _% nto disclose that he was using a testosterone gel pre-5 u$ `1 E" A0 u0 {
scribed by his family physician for decreased libido
& }+ c) T! E- @0 C& D$ d1 e3 zsecondary to depression.
* C" B5 i6 @6 U6 m2 ?The child slept in the same bed with parents., z' t( U Q% \' b2 @
The father would hug the baby and hold him on his- p- |: U* S% N% x( a+ }
chest for a considerable period of time, causing sig-
/ C6 H8 C8 z# snificant bare skin contact between baby and father.% {, P8 z" h6 j- K n
The father also admitted that after the phone call,. z o+ y+ ]" |4 f( y
when he learned the testosterone level in the baby0 W. z8 f3 C t4 y
was high, he then read the product information
, n) ?2 p) X0 F8 `packet and concluded that it was most likely the rea-
' `' A( I( f9 _% f+ A, hson for the child’s virilization. At that time, they9 s. H' V. e* G, v+ Y# @
decided to put the baby in a separate bed, and the
$ b8 V" W* i4 R( tfather was not hugging him with bare skin and had
# Q/ G) K3 {: u0 D- Rbeen using protective clothing. A repeat testosterone
( N7 o6 l( F; R! K0 \test was ordered, but the family did not go to the
8 N" t/ M8 P* }1 m" Y0 W( o" N& claboratory to obtain the test.- A3 u) e3 m$ X" N
Discussion0 k/ {7 Z6 B* O7 H
Precocious puberty in boys is defined as secondary! G' _6 m7 D1 f2 T5 G/ ]
sexual development before 9 years of age.1,4
{ N4 X& l0 O0 p1 |+ fPrecocious puberty is termed as central (true) when C) m E1 Z8 r f) W# d
it is caused by the premature activation of hypo-- A5 p- }# B# u1 m' c/ X1 I& a
thalamic pituitary gonadal axis. CPP is more com-# `; h4 S* W( R% v' `
mon in girls than in boys.1,3 Most boys with CPP
# q) ]% W9 f1 D4 c* O6 B8 [2 Smay have a central nervous system lesion that is" D7 n# }! ~5 p# V% d) Q7 P
responsible for the early activation of the hypothal-
/ H- t8 }6 l: Y0 _4 W Lamic pituitary gonadal axis.1-3 Thus, greater empha-% ?. q" N+ @ s6 e% B- @9 l
sis has been given to neuroradiologic imaging in% {& a, T9 m S# c
boys with precocious puberty. In addition to viril-
8 s' q! F! {. Mization, the clinical hallmark of CPP is the symmet-
3 q1 `% K# V5 Y( H1 frical testicular growth secondary to stimulation by
: \% c6 ?% H% M, H+ Z2 B: P9 Rgonadotropins.1,3
2 Y2 _4 x' s! Z9 J/ @/ WGonadotropin-independent peripheral preco-) |) Y1 d+ x z9 f' b) R
cious puberty in boys also results from inappropriate4 n# S, A+ l+ a) l, K
androgenic stimulation from either endogenous or
$ R1 i; ^8 Z( a. T% |2 S5 Xexogenous sources, nonpituitary gonadotropin stim-
$ q2 _# r' f" ^4 T- W- Z7 @3 k: Eulation, and rare activating mutations.3 Virilizing5 e- ^. ?6 M% R, |
congenital adrenal hyperplasia producing excessive0 N- O9 U+ m4 E6 G' n. W+ k5 v
adrenal androgens is a common cause of precocious& x- Z# D) b8 H; u* l+ k0 h3 }
puberty in boys.3,4
3 k' x( \5 {% R+ s, MThe most common form of congenital adrenal
, _# e5 j$ o+ F7 y9 u* Ehyperplasia is the 21-hydroxylase enzyme deficiency.' b5 k& p N5 m8 x# S
The 11-β hydroxylase deficiency may also result in) ]2 S9 F) w1 _- O
excessive adrenal androgen production, and rarely,
7 Q9 _4 m- z7 p5 M k' z2 O. ran adrenal tumor may also cause adrenal androgen' Y" H+ O" t; i$ J! C; ^
excess.1,3
\: R" z( C9 u6 N$ q* H' vat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
5 M4 X7 z/ i! a& f( H; B. [- y542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
& |# C4 B/ p" h$ T& r, fA unique entity of male-limited gonadotropin-
4 M% c0 p( l$ nindependent precocious puberty, which is also known8 @' h! d' y( v: i4 Q. z3 g
as testotoxicosis, may cause precocious puberty at a
2 V, J4 q' U) x: o; v. l. S+ ivery young age. The physical findings in these boys
" L$ Q; I3 I6 d+ q7 ~with this disorder are full pubertal development,
/ p9 ]+ X, q. @! a- g/ ?4 s- }including bilateral testicular growth, similar to boys! i |5 L3 u' N2 U" {' C
with CPP. The gonadotropin levels in this disorder
( V1 W1 ]% k- l3 q+ I7 Care suppressed to prepubertal levels and do not show
3 Q/ Z, F) A# j* ?pubertal response of gonadotropin after gonadotropin-
9 l) ^$ w( x) p2 l( p. R9 c9 vreleasing hormone stimulation. This is a sex-linked
+ C& E2 T+ x& U2 H9 f0 @- Lautosomal dominant disorder that affects only0 V$ l2 B& c) M6 N
males; therefore, other male members of the family
) V; ?" t) o0 ?1 G1 kmay have similar precocious puberty.3; [2 {; P( @3 P1 X# O e1 l
In our patient, physical examination was incon-8 ~ }- ]4 ~4 G) y9 X2 D
sistent with true precocious puberty since his testi-% E1 E% R% W! E/ w1 m2 l
cles were prepubertal in size. However, testotoxicosis
6 e% f2 l5 X. `$ H Wwas in the differential diagnosis because his father! C- X/ F/ L& J7 K
started puberty somewhat early, and occasionally,% b8 @; n8 c% L5 D& f% u' n
testicular enlargement is not that evident in the3 c0 M9 M9 v9 ^
beginning of this process.1 In the absence of a neg-1 K% c2 _$ S5 F- M
ative initial history of androgen exposure, our+ }" d; Y8 M! d+ P4 w3 Y: @
biggest concern was virilizing adrenal hyperplasia,# L8 a6 B, Z9 O- J3 U2 O
either 21-hydroxylase deficiency or 11-β hydroxylase
) B8 r: g' { d( O& b1 F/ Xdeficiency. Those diagnoses were excluded by find-& @& ]$ P2 K( z& H8 T+ P% y! w
ing the normal level of adrenal steroids.
% {/ L8 v E% eThe diagnosis of exogenous androgens was strongly0 l3 ?8 h0 e+ T; b
suspected in a follow-up visit after 4 months because
" y a/ \2 Y6 r! ?3 Lthe physical examination revealed the complete disap-
% T. W0 ` I! q4 \7 B! dpearance of pubic hair, normal growth velocity, and1 l- ]6 b6 f5 A- ^4 p
decreased erections. The father admitted using a testos-
* t, a+ J2 c, j: Q @' [( \# vterone gel, which he concealed at first visit. He was" c% t% _9 ]* |0 h1 [
using it rather frequently, twice a day. The Physicians’ v$ O2 l4 x4 T' q$ k
Desk Reference, or package insert of this product, gel or
+ K. W9 _5 R" k7 G1 _cream, cautions about dermal testosterone transfer to5 ^6 F5 C( _0 Y8 V. ~3 M5 g
unprotected females through direct skin exposure.0 Q$ n0 Y4 \9 N' Y
Serum testosterone level was found to be 2 times the, k6 X/ \5 e3 W0 r3 _! Z
baseline value in those females who were exposed to& C/ _3 R- _1 _5 {% ]% F
even 15 minutes of direct skin contact with their male
% K" {, S# C/ q: p% t6 q+ c/ ~partners.6 However, when a shirt covered the applica-
) Q4 }( G- j& G$ [ x3 e' h: otion site, this testosterone transfer was prevented.
7 G+ {7 w8 |* z8 ^Our patient’s testosterone level was 60 ng/mL,/ W' X/ [4 v% q& l. _) D
which was clearly high. Some studies suggest that
9 m" c. F2 i4 `& j# z7 X- z/ ddermal conversion of testosterone to dihydrotestos-
! n7 C% }; H' [% g; J: Gterone, which is a more potent metabolite, is more0 W& O7 r4 t( t. l5 L6 D
active in young children exposed to testosterone
. v. Y( O% R& |exogenously7; however, we did not measure a dihy- x: f% l2 l# w/ |
drotestosterone level in our patient. In addition to; z+ [* o9 y! R* d/ u
virilization, exposure to exogenous testosterone in
1 W" U+ ]( m- |0 Y/ n8 `( [$ wchildren results in an increase in growth velocity and
) l+ ]$ F V4 {( F) hadvanced bone age, as seen in our patient.
$ M% D( k7 O0 U& tThe long-term effect of androgen exposure during+ b8 O& C3 Y/ ^
early childhood on pubertal development and final* z- n @4 w" t- V3 d! l
adult height are not fully known and always remain
s+ R$ ^: U$ ], {a concern. Children treated with short-term testos-1 J* d- x4 p' S0 Z2 E" e7 }
terone injection or topical androgen may exhibit some4 s0 I3 B2 S( Y6 \
acceleration of the skeletal maturation; however, after
2 X l! O9 w/ T7 }& o9 n) |cessation of treatment, the rate of bone maturation7 h2 s( X4 C. W
decelerates and gradually returns to normal.8,9
( c; X* q2 y u& k& CThere are conflicting reports and controversy
. ~( t- o5 c7 b5 |over the effect of early androgen exposure on adult5 D. B; f R- ?. J8 x% n
penile length.10,11 Some reports suggest subnormal
* R5 X+ {; K. Z1 i$ _5 Padult penile length, apparently because of downreg-
' w6 s4 G: J: k# D" a. aulation of androgen receptor number.10,12 However,
/ y k9 x7 i8 D9 T! s8 N' R; KSutherland et al13 did not find a correlation between) G) H$ W; S- }
childhood testosterone exposure and reduced adult0 T9 L3 ]7 g1 A. h, x& o: W
penile length in clinical studies.
! M. D* `. U- J. | \% I! JNonetheless, we do not believe our patient is. M0 o) Y7 O6 M% e& d6 D4 j
going to experience any of the untoward effects from: d2 F" E' Y. i8 D- P( O" n. |
testosterone exposure as mentioned earlier because
2 v# ~9 D9 O' m/ W9 {# rthe exposure was not for a prolonged period of time.: j r$ L) M" n) _5 F8 C
Although the bone age was advanced at the time of8 C5 X [+ x% \! L! j8 d! \
diagnosis, the child had a normal growth velocity at
" _6 O: m( q& m X4 p( `the follow-up visit. It is hoped that his final adult
& ~) r& S8 f z) E; `2 ~; ]height will not be affected.' I6 G- g6 g" X8 G# j# L
Although rarely reported, the widespread avail-. m3 Y1 h! O: ~; J
ability of androgen products in our society may
7 u3 F; V+ ?* u7 Windeed cause more virilization in male or female* g# Q4 f9 r2 l4 N p& V( |( H
children than one would realize. Exposure to andro-( J8 m2 ^& {6 A% D
gen products must be considered and specific ques-
( r; b j# d3 ztioning about the use of a testosterone product or
6 e# F' G" k$ r Lgel should be asked of the family members during
% A6 R! w, Q/ x$ Zthe evaluation of any children who present with vir-
8 P% T" A. M, C' oilization or peripheral precocious puberty. The diag-
8 A1 D8 |/ u S2 h% v4 y4 ]6 ]nosis can be established by just a few tests and by2 v1 z3 m# B" ]% w
appropriate history. The inability to obtain such a C* T; {6 z% V& [: s
history, or failure to ask the specific questions, may
- o3 e2 R# F. xresult in extensive, unnecessary, and expensive, C/ ]2 j5 `3 c$ \! U' s
investigation. The primary care physician should be
# x: w$ V- x4 @: e+ f0 p1 g Eaware of this fact, because most of these children [; ~. V+ S% s; m$ O
may initially present in their practice. The Physicians’
/ e# I6 I( I3 UDesk Reference and package insert should also put a- c/ x' L) q3 S2 I) ^
warning about the virilizing effect on a male or
% Y- p4 P% d9 o* _; ^) B% b2 {, z* Afemale child who might come in contact with some-
$ ?1 S9 o/ t6 g$ N |1 \one using any of these products.4 B5 f& j, p$ L
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1 p2 x- `) w0 L2 `* [3 s0 N8. Guthrie RD, Smith DW, Graham CB. Testosterone
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