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is a significant concern for physicians. Central
]4 |5 S8 ]0 b, J1 Cprecocious puberty (CPP), which is mediated( A1 _; R4 c, g
through the hypothalamic pituitary gonadal axis, has2 X* h# B" B5 T) o+ P5 v
a higher incidence of organic central nervous system
0 Z" J- e9 o! C( \lesions in boys.1,2 Virilization in boys, as manifested2 X2 M* p) Q! i5 b3 y
by enlargement of the penis, development of pubic' r$ r% J X$ d) `2 }
hair, and facial acne without enlargement of testi-; a2 W* B R! |' ?/ g2 A/ d
cles, suggests peripheral or pseudopuberty.1-3 We0 d1 r P* f* D" h" `. ?" k' R% T
report a 16-month-old boy who presented with the
. I4 { v) T: j8 }# v1 }enlargement of the phallus and pubic hair develop-+ i# R, a/ a* K5 T5 |! k' S% [' e6 m
ment without testicular enlargement, which was due5 d9 b" g' f) d2 F* J. |8 l7 w) W
to the unintentional exposure to androgen gel used by* v7 K& Q) k9 N1 j& Q- B3 r
the father. The family initially concealed this infor-
' g$ L0 F4 d& S$ T% w, Zmation, resulting in an extensive work-up for this8 M2 |# p( w7 S4 `& G
child. Given the widespread and easy availability of: @0 Y* H9 @ L3 e4 J8 U" O+ S; w
testosterone gel and cream, we believe this is proba-
: M9 t$ u F R* g& G/ ably more common than the rare case report in the
4 n8 c/ s! n3 x; b8 sliterature.46 R' u) z' v X L
Patient Report
! ^+ q9 W0 |3 z0 t" ZA 16-month-old white child was referred to the
8 Y* c* m7 S; m2 o# G" Wendocrine clinic by his pediatrician with the concern+ N5 u5 J3 L# ^' [. G( p
of early sexual development. His mother noticed
4 I# V1 j6 \9 y/ p& J% v: J, r6 l% Tlight colored pubic hair development when he was
2 A0 ^! k) }8 E9 G ]: ~- p- h# CFrom the 1Division of Pediatric Endocrinology, 2University of: D, T E4 b) P: e* z* |
South Alabama Medical Center, Mobile, Alabama.
/ u+ N5 k* M' g7 OAddress correspondence to: Samar K. Bhowmick, MD, FACE,3 H! ^0 e# k8 F( r" {+ Z9 v; B5 ^
Professor of Pediatrics, University of South Alabama, College of
7 r& }/ B/ [5 K7 F0 C' rMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
. ^ T/ I0 w* {" w' W' \e-mail: [email protected].) q C. M% I2 Z- D% V& H
about 6 to 7 months old, which progressively became( W; G$ b3 h9 L% b2 l
darker. She was also concerned about the enlarge-
! M Y; Y9 V, l7 y$ oment of his penis and frequent erections. The child
" C' p1 e5 R( b0 T, mwas the product of a full-term normal delivery, with
# D! U* ^* Y7 y6 d9 za birth weight of 7 lb 14 oz, and birth length of9 k3 C8 {; D$ M% D& u7 W+ Z% M
20 inches. He was breast-fed throughout the first year( i( k; Y2 M H
of life and was still receiving breast milk along with
( X$ l$ S, N' f; Gsolid food. He had no hospitalizations or surgery,
9 S& z# |1 B1 r( _and his psychosocial and psychomotor development7 ]7 o6 v- ]8 o1 L$ D2 u# w; P
was age appropriate.
8 N- \2 C Y. }The family history was remarkable for the father,
0 O2 o% e ^( v% d* hwho was diagnosed with hypothyroidism at age 16,
2 A- C$ m+ Q: d8 z$ |/ t* ~4 Y% Awhich was treated with thyroxine. The father’s
; c& f' h' I) x( s8 Oheight was 6 feet, and he went through a somewhat
, u5 S+ @+ Z9 i% ^6 A3 z+ _: fearly puberty and had stopped growing by age 14.6 D2 i2 q; ^& {% q9 N/ B2 ^' U5 }: }
The father denied taking any other medication. The5 o6 {" T' V9 U0 S
child’s mother was in good health. Her menarche* n! L# ^) q1 W, m5 h7 A- o
was at 11 years of age, and her height was at 5 feet
! d, P2 S; A% I* s8 Z5 inches. There was no other family history of pre-! d# e+ o* [! _+ p2 w! g
cocious sexual development in the first-degree rela-
) u9 @# `7 ]7 g' T( utives. There were no siblings.4 ^& p9 X9 C( _/ {! {; A& j
Physical Examination
+ p" q) c4 }# C7 U6 [The physical examination revealed a very active,4 s( q& B+ W; @ l9 [- D
playful, and healthy boy. The vital signs documented
: U# ^, P$ Y7 ?9 Va blood pressure of 85/50 mm Hg, his length was
, a3 q2 F, n" a% O90 cm (>97th percentile), and his weight was 14.4 kg
* o6 Y ~% S$ n(also >97th percentile). The observed yearly growth4 n# p* e s5 s3 C7 t2 N( \
velocity was 30 cm (12 inches). The examination of
0 y4 t) l+ U) m, sthe neck revealed no thyroid enlargement.0 _. a3 b# Z% z" Y4 a( V! D
The genitourinary examination was remarkable for4 i9 q/ g- G8 U3 Q u2 }2 H8 \
enlargement of the penis, with a stretched length of5 U" n& g A* r) h
8 cm and a width of 2 cm. The glans penis was very well0 K, l+ B$ |4 o1 B7 z- ?
developed. The pubic hair was Tanner II, mostly around, @) {0 i( K( X4 C& M
540
0 d4 {. p% E9 i% X: ]) \ m' pat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
: i+ _- G" _( e7 ]" U5 _6 o" ^the base of the phallus and was dark and curled. The- H0 f( Z1 S, }. {# U
testicular volume was prepubertal at 2 mL each. w5 R c4 o$ r6 Z5 }
The skin was moist and smooth and somewhat
9 p3 p7 H7 K6 C: }" J6 loily. No axillary hair was noted. There were no
* y( p& X O& Q$ A+ pabnormal skin pigmentations or café-au-lait spots.
% B0 w1 |) z6 F0 CNeurologic evaluation showed deep tendon reflex 2+7 x* T4 g+ P1 ~( y1 v& E
bilateral and symmetrical. There was no suggestion/ l/ f/ c( C# A6 P9 p4 C
of papilledema.
# ]5 `* @9 C' y5 JLaboratory Evaluation# z2 ]* Z9 J# s! ^5 Y" q& r( o
The bone age was consistent with 28 months by; I2 g2 Y( Z( f6 ?1 k, A
using the standard of Greulich and Pyle at a chrono-
0 [9 B! I8 C% L5 d8 }logic age of 16 months (advanced).5 Chromosomal5 _2 V' i8 }" }- a v+ s4 [ l5 c
karyotype was 46XY. The thyroid function test! o% i9 E4 K/ H3 ~7 L8 [
showed a free T4 of 1.69 ng/dL, and thyroid stimu-" `0 b& N* D) B% ?0 `; ^8 d
lating hormone level was 1.3 µIU/mL (both normal). D8 [' p( Q, K$ Z2 N
The concentrations of serum electrolytes, blood5 p7 d( |, R3 {6 a* x
urea nitrogen, creatinine, and calcium all were
% I/ `7 Y6 T, B6 ?/ mwithin normal range for his age. The concentration
+ D- ^% l/ J8 G# U& ^of serum 17-hydroxyprogesterone was 16 ng/dL( F3 \* c J4 v$ Y
(normal, 3 to 90 ng/dL), androstenedione was 20+ [. E2 @% J1 @+ u4 w
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-' z" j) g: b- b0 m: h2 d) }
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
: K" b* y: n4 Y' @. Gdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
" u) F( t& v- G8 ?& i; c+ H49ng/dL), 11-desoxycortisol (specific compound S)
0 N, U- A( x) u5 u6 {9 fwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-" p7 q3 X# d8 v8 t
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total; ~, |9 K2 z6 I, E" b8 z2 {& y
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
- R. E4 b6 [( z( p% D( K4 Yand β-human chorionic gonadotropin was less than: P& [+ \3 y; Y% L1 Z4 f; m
5 mIU/mL (normal <5 mIU/mL). Serum follicular
0 a7 u- }# i; d' gstimulating hormone and leuteinizing hormone# y7 M3 p' r8 M' G
concentrations were less than 0.05 mIU/mL" Y: r5 P: z. s8 E7 h6 T
(prepubertal).
' h j T, v- Y! B: v/ w7 o# l8 S vThe parents were notified about the laboratory U+ D" N8 [8 F- I x6 N' O( |
results and were informed that all of the tests were( k* y; K- J; y) t
normal except the testosterone level was high. The
/ j9 T( u# N; r( |7 e! X" Ufollow-up visit was arranged within a few weeks to
/ f% K, I, Y3 M* k: D( [obtain testicular and abdominal sonograms; how-& H- C: K& p0 A- M5 D& P( e! i
ever, the family did not return for 4 months.
8 n( `8 q: ^8 f1 |: I% {$ MPhysical examination at this time revealed that the
" z# P' Z5 @: k+ y* O$ Q% U$ cchild had grown 2.5 cm in 4 months and had gained
0 _3 r( K! E3 @( E+ t2 kg of weight. Physical examination remained+ n5 r2 t) T9 C( P
unchanged. Surprisingly, the pubic hair almost com-- o2 }4 f/ g0 t" [+ t
pletely disappeared except for a few vellous hairs at
- ?& A* T; x2 Ythe base of the phallus. Testicular volume was still 20 Y0 N2 j1 X" w' x9 `
mL, and the size of the penis remained unchanged.# ]( Q- `& y7 ^2 U, m( ]
The mother also said that the boy was no longer hav-
! B: G* |3 ~: M$ L( S# V( J$ m/ u5 Sing frequent erections. S5 c0 ~. V5 {( {
Both parents were again questioned about use of8 G. L) |9 z* G
any ointment/creams that they may have applied to1 ^- d/ V) U9 B9 ]( s/ R
the child’s skin. This time the father admitted the
# o2 h- a! p: N- zTopical Testosterone Exposure / Bhowmick et al 541
0 b; _3 w- W3 M7 n3 Quse of testosterone gel twice daily that he was apply-
, U6 J) A7 z5 I% {3 king over his own shoulders, chest, and back area for% C$ v, |4 U% _+ [5 _+ R
a year. The father also revealed he was embarrassed+ C8 \) `( r6 h1 [" A; U
to disclose that he was using a testosterone gel pre-4 V1 @& v, A- {- C, G
scribed by his family physician for decreased libido
4 L6 f. J7 z( q9 _secondary to depression., d) x& G! Q6 b
The child slept in the same bed with parents.* }6 n# T0 }3 C, z
The father would hug the baby and hold him on his5 f4 J6 t" B! d
chest for a considerable period of time, causing sig-
- p" F) {( z$ W) K* Onificant bare skin contact between baby and father., w! v5 W9 @1 Y7 \
The father also admitted that after the phone call,
1 h- D7 D, d; hwhen he learned the testosterone level in the baby
, W0 ?2 `, {/ P& j' H8 k5 ]& E3 Bwas high, he then read the product information: h4 I4 Z7 \2 o! P1 ~
packet and concluded that it was most likely the rea-2 j! n6 U4 s2 I+ t/ U1 {5 ]
son for the child’s virilization. At that time, they
# r0 p6 |% D! |; j, Zdecided to put the baby in a separate bed, and the
) _" A8 l1 V7 afather was not hugging him with bare skin and had5 _7 e5 g5 ~( k5 s6 o5 `
been using protective clothing. A repeat testosterone: M2 ~ u8 h+ J+ T; m, q
test was ordered, but the family did not go to the
" H5 N4 y' c6 ^1 C$ glaboratory to obtain the test.
$ ~ h4 I r3 O8 e ^) dDiscussion
8 O* x$ [2 q, @7 \7 z( P a/ ]2 pPrecocious puberty in boys is defined as secondary
* t9 a) N1 K; o* Z4 i' H) g! {sexual development before 9 years of age.1,4
% E/ C8 |6 Q }7 ^8 aPrecocious puberty is termed as central (true) when: C0 Q2 Y* P! \( B2 t( {% M8 x
it is caused by the premature activation of hypo-
6 G& A6 x j/ ]" R9 Kthalamic pituitary gonadal axis. CPP is more com-
& J; H. G$ J+ [! [: Q) Kmon in girls than in boys.1,3 Most boys with CPP
# C: b# Q2 }( [$ W$ ]may have a central nervous system lesion that is
. v! h% w. q7 a) nresponsible for the early activation of the hypothal-
& G8 A9 R; u1 y% d) Damic pituitary gonadal axis.1-3 Thus, greater empha-# h' o0 f, M0 b0 |- h3 q' v
sis has been given to neuroradiologic imaging in2 D' r! q1 x- a: r
boys with precocious puberty. In addition to viril-+ Q( a6 l+ d: c. H. w" V6 b
ization, the clinical hallmark of CPP is the symmet-
. x, y8 j( {: y- e4 rrical testicular growth secondary to stimulation by5 T& L5 V: C1 Q
gonadotropins.1,3- c! B9 u8 R3 I, A8 Q
Gonadotropin-independent peripheral preco-
- _0 N, c9 y# }: ]$ W3 pcious puberty in boys also results from inappropriate+ d1 l2 e m2 r# Z( D% G7 f* L
androgenic stimulation from either endogenous or7 \6 K# M" [% @8 A. ]4 E0 V5 K5 ?9 v
exogenous sources, nonpituitary gonadotropin stim-
6 S( }. t M: t* C# s9 w1 |ulation, and rare activating mutations.3 Virilizing4 o3 n/ p. d: C. t/ z
congenital adrenal hyperplasia producing excessive, y3 \- L! I4 E' A+ Q1 G3 G) b
adrenal androgens is a common cause of precocious
7 ~$ L7 o/ ?' |) I: t, m0 M3 \puberty in boys.3,4
. s% {( }( X! Z% O% }' ^% u# lThe most common form of congenital adrenal8 j% X; M" g" }: [7 l
hyperplasia is the 21-hydroxylase enzyme deficiency.
( m8 N& Y& T3 P0 v- } z8 t8 nThe 11-β hydroxylase deficiency may also result in
) ^) `, r4 @8 k+ d w Iexcessive adrenal androgen production, and rarely,
/ M2 M; o, b) \ @) han adrenal tumor may also cause adrenal androgen7 G- t' ~. h n
excess.1,39 j- I, X+ h- N. Y
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from2 h) Q) D5 @; e2 D4 R' p
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
. d. c- ^& f; \( yA unique entity of male-limited gonadotropin-% O8 m! V- F2 x8 ?
independent precocious puberty, which is also known$ }' B% y1 _* v2 ~5 A* q. s1 Q
as testotoxicosis, may cause precocious puberty at a3 _ ^5 \# p( m: a+ x
very young age. The physical findings in these boys7 ?* q" ^4 Y0 x" F
with this disorder are full pubertal development,' V9 |% t2 r2 h) p7 [' B S9 s
including bilateral testicular growth, similar to boys6 j, D! L$ k8 X4 C7 ?/ E/ E
with CPP. The gonadotropin levels in this disorder5 {# B$ x2 U; G0 G; v4 h6 B8 a
are suppressed to prepubertal levels and do not show
1 i$ V: L; w! H' L8 g7 bpubertal response of gonadotropin after gonadotropin-
5 G5 E$ h9 j4 |% Wreleasing hormone stimulation. This is a sex-linked& i+ \9 ]5 V- y; ^
autosomal dominant disorder that affects only
# }; H- n& C& {. T- C+ j8 gmales; therefore, other male members of the family; j0 u4 A6 o7 f
may have similar precocious puberty.32 t0 N* g8 X$ a, E' f5 g; z
In our patient, physical examination was incon-
! |" N6 a. G: |2 G. X6 hsistent with true precocious puberty since his testi-
$ M7 q1 X& D! c. E3 }3 Fcles were prepubertal in size. However, testotoxicosis1 N1 e- E; A/ @
was in the differential diagnosis because his father' v" ~ A' S# Q" X u
started puberty somewhat early, and occasionally,9 f/ T# V g3 @- L
testicular enlargement is not that evident in the
& |5 p8 k& w" x( |. f6 ~2 `& x4 |beginning of this process.1 In the absence of a neg-9 ]5 H: b" X6 O/ R* t5 g5 y1 A
ative initial history of androgen exposure, our
. v# H E& _( S2 C/ l9 Z6 nbiggest concern was virilizing adrenal hyperplasia,: c; A4 H$ T2 ^. t+ @
either 21-hydroxylase deficiency or 11-β hydroxylase7 R* A& M! L- g3 c0 N- _5 w5 X
deficiency. Those diagnoses were excluded by find-
5 ^8 b5 J- P5 F7 ?ing the normal level of adrenal steroids.
* U/ a0 ^8 ~( S! ?+ QThe diagnosis of exogenous androgens was strongly% C. `1 u) d: E, n" m- s' G
suspected in a follow-up visit after 4 months because
* X" o7 e$ {* n. V: kthe physical examination revealed the complete disap-
6 B* s5 o- v3 r7 Qpearance of pubic hair, normal growth velocity, and# y6 ~. } R Y1 X
decreased erections. The father admitted using a testos-1 E( T0 ~/ l1 c. f
terone gel, which he concealed at first visit. He was' r/ u! Y! P! m2 H' k
using it rather frequently, twice a day. The Physicians’3 u9 e3 D0 L* O% ?
Desk Reference, or package insert of this product, gel or
; R5 x, X" G2 Pcream, cautions about dermal testosterone transfer to
7 i* l( a6 V% O) N- W1 g/ ^unprotected females through direct skin exposure.
; Y2 N8 h( p iSerum testosterone level was found to be 2 times the
0 F' j. S @$ b0 `$ i& Kbaseline value in those females who were exposed to9 h( D( ]9 X2 d: Y! i/ |. r
even 15 minutes of direct skin contact with their male
! G& g3 W* S) \ O3 o2 Kpartners.6 However, when a shirt covered the applica-
. ^1 D( a! u, |. o+ Z- h6 Dtion site, this testosterone transfer was prevented. @' S# Q) p6 H3 F
Our patient’s testosterone level was 60 ng/mL,; [& ?. z1 N+ Y: ]' N4 v
which was clearly high. Some studies suggest that6 P" b3 l+ N+ l% T7 _( j
dermal conversion of testosterone to dihydrotestos-
6 l/ J7 L4 i6 U! _/ Xterone, which is a more potent metabolite, is more
0 `+ ~% k# _6 Y" _0 `4 f7 Sactive in young children exposed to testosterone
9 s. k/ l3 ~6 k7 C5 mexogenously7; however, we did not measure a dihy- T m$ E( @' U Q4 E$ F. A0 e
drotestosterone level in our patient. In addition to- V" I* N% q3 n% O$ Q/ j8 Z n
virilization, exposure to exogenous testosterone in
% k0 @5 @5 r. Q; mchildren results in an increase in growth velocity and
1 V C8 O- ?3 f0 qadvanced bone age, as seen in our patient.# D, \% \- k2 t
The long-term effect of androgen exposure during
/ Q% E4 R7 S6 Z' Y: Dearly childhood on pubertal development and final
! w+ x: l6 V7 I8 J! I0 b4 Aadult height are not fully known and always remain
& x `6 m9 Z4 A- Na concern. Children treated with short-term testos-/ @' S; T& ^( }- R0 F [* U
terone injection or topical androgen may exhibit some
+ z) X/ g$ q2 p5 y3 Gacceleration of the skeletal maturation; however, after
5 P: x. h6 ~3 w3 D9 B. t; Qcessation of treatment, the rate of bone maturation
4 O' h4 v$ ~+ e8 ?# ^) Q3 _decelerates and gradually returns to normal.8,9
- F% c( H s' h: q+ v/ t- U( `There are conflicting reports and controversy
; `5 G% [" V+ v5 i: X ^over the effect of early androgen exposure on adult
' P. ~( J" \4 ~penile length.10,11 Some reports suggest subnormal+ [5 D6 t* X4 |5 j! }- `
adult penile length, apparently because of downreg- @9 }) u P+ C, p/ C; {- }
ulation of androgen receptor number.10,12 However,9 E! h' P6 H" t6 S
Sutherland et al13 did not find a correlation between
$ }( ~2 e b9 }$ u& a! Y: g' schildhood testosterone exposure and reduced adult
6 o3 V0 H- Z1 b* ?penile length in clinical studies.
+ _' R% c* J( l w4 X& K5 pNonetheless, we do not believe our patient is
- @" I4 d+ _6 G* V) i% D% Sgoing to experience any of the untoward effects from6 W7 p0 D8 C, ?
testosterone exposure as mentioned earlier because! {7 e+ S2 `' M
the exposure was not for a prolonged period of time.4 ?1 z5 T. ~, C/ r3 k2 }) W1 I0 B
Although the bone age was advanced at the time of
: w* ^% V. r5 s: f% W! Z5 ]diagnosis, the child had a normal growth velocity at
- \( A/ @8 i/ q9 s" W1 Mthe follow-up visit. It is hoped that his final adult
- h9 h3 c' g9 k2 yheight will not be affected.
1 s" `" w; z! Q s4 B( d+ o1 dAlthough rarely reported, the widespread avail-; e& r7 V6 j8 @9 p5 C& g
ability of androgen products in our society may; _. N+ e0 o) G5 M; D6 S! R( M5 @' b
indeed cause more virilization in male or female8 _# M; T, b9 H5 U8 u
children than one would realize. Exposure to andro-
9 D# a7 p7 c) L+ P; t4 Wgen products must be considered and specific ques-
( B) I) c$ G4 r* U' O% g4 u* Qtioning about the use of a testosterone product or
3 D( S: U5 ]( U' c6 bgel should be asked of the family members during5 r3 y2 Q: X% j: P# v' q
the evaluation of any children who present with vir-& P* b- L2 A# R/ Z+ {
ilization or peripheral precocious puberty. The diag-
1 c+ j% k1 c9 U/ ynosis can be established by just a few tests and by
, S) U, E' z( n: Happropriate history. The inability to obtain such a9 s( V$ A- t3 N3 Y
history, or failure to ask the specific questions, may
0 p2 X1 L2 z9 Iresult in extensive, unnecessary, and expensive3 m8 F( f4 i" r3 v: D
investigation. The primary care physician should be
# ~3 r( O6 ^$ z8 {6 P- {aware of this fact, because most of these children
7 }/ v: u M+ w, j: r' Lmay initially present in their practice. The Physicians’9 F8 l* ~ p$ a+ ?5 G E
Desk Reference and package insert should also put a, g8 I! H, `& I( }. {5 S
warning about the virilizing effect on a male or
# g. Y9 J m. r; Zfemale child who might come in contact with some-
/ A. \5 y/ i; D& \2 t0 C- L8 Pone using any of these products." c' ]* r) u; }7 H4 u
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