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is a significant concern for physicians. Central! E$ w: M: ` m: A. [
precocious puberty (CPP), which is mediated
' }' f) t0 \; w+ h Z) U5 rthrough the hypothalamic pituitary gonadal axis, has |7 p, @, d! B" F5 ?# h
a higher incidence of organic central nervous system
5 P( F+ a- s9 F+ B w! s# Tlesions in boys.1,2 Virilization in boys, as manifested1 h0 r2 J+ f* Q. P* t
by enlargement of the penis, development of pubic' i1 p; m/ x8 @0 [$ @/ E( S6 Y
hair, and facial acne without enlargement of testi-
: c9 m, h: f2 Xcles, suggests peripheral or pseudopuberty.1-3 We
# h4 M, Y' M& greport a 16-month-old boy who presented with the1 ?6 }4 i$ A3 p' L* d$ X" [- U: l/ p
enlargement of the phallus and pubic hair develop-7 i7 v) x. [ d0 ]
ment without testicular enlargement, which was due
! j; @4 h2 P7 O$ uto the unintentional exposure to androgen gel used by" i$ U1 _3 H8 l8 _ b
the father. The family initially concealed this infor-
2 r! q7 ]% h- ]mation, resulting in an extensive work-up for this. n2 M! y- A' J
child. Given the widespread and easy availability of' c" y. V2 D* ^: h0 q4 E
testosterone gel and cream, we believe this is proba-
. E. I( q5 P/ x# q) O0 h' rbly more common than the rare case report in the9 M+ \/ @/ f2 Z/ j6 t& n
literature.4
, g y2 i! @: H5 G2 l! L, v& @Patient Report
$ J w* v9 f+ d) A. D( pA 16-month-old white child was referred to the4 T4 ?/ V/ J# \, w( e
endocrine clinic by his pediatrician with the concern
1 m {/ l) @' Eof early sexual development. His mother noticed2 L5 Q3 V% \! k: J
light colored pubic hair development when he was; J [5 o& F8 D; [& R! C% P4 q
From the 1Division of Pediatric Endocrinology, 2University of! y1 q1 q% i. w- m q- |( g, ~
South Alabama Medical Center, Mobile, Alabama.
, g5 H" ~: w' ]; i8 hAddress correspondence to: Samar K. Bhowmick, MD, FACE,
0 M" O' T2 N: [! I& CProfessor of Pediatrics, University of South Alabama, College of
9 U& ^- Q3 y/ ^; j* D) VMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
! H/ M4 U- u e3 Oe-mail: [email protected].
9 ]3 X% W# w( V7 Y$ g- K! Vabout 6 to 7 months old, which progressively became3 L" n) M d2 y- O: L' S# w8 N
darker. She was also concerned about the enlarge-/ m0 |3 E; \* ?/ W; E9 p1 Q7 D
ment of his penis and frequent erections. The child& R6 u9 u8 R" W; A5 M D2 `
was the product of a full-term normal delivery, with% |( u( c+ F' J( y0 ] z
a birth weight of 7 lb 14 oz, and birth length of0 g3 g% K3 J' C+ y' i) C2 p5 z
20 inches. He was breast-fed throughout the first year
* G/ L' ?4 j+ S) _' |of life and was still receiving breast milk along with
c. \7 Q L* t4 @+ R! ? Ssolid food. He had no hospitalizations or surgery,
( Q: f$ w5 o$ ~; q# h `and his psychosocial and psychomotor development3 Q N/ ?% [/ m" O
was age appropriate.
c* G& A% f3 m7 bThe family history was remarkable for the father,
$ y9 P: x' p) Z* Uwho was diagnosed with hypothyroidism at age 16, ^3 F4 E7 x& k$ m4 J: i
which was treated with thyroxine. The father’s
' ]! a+ H" L* u1 h# Hheight was 6 feet, and he went through a somewhat* t1 d. _8 B0 [ V$ q
early puberty and had stopped growing by age 14.
2 j! Y8 ]& w8 ?The father denied taking any other medication. The
: }5 J- `; y, L0 Xchild’s mother was in good health. Her menarche$ e, O3 D/ {) M" f) y( G6 s
was at 11 years of age, and her height was at 5 feet% p; l+ R# k0 Y) e
5 inches. There was no other family history of pre-
) b Z- q& {# [* r* L3 u- Kcocious sexual development in the first-degree rela-
8 @7 k# b, y. w9 v) vtives. There were no siblings.4 Y! K4 [0 O, w% \; H: j
Physical Examination
; o" d4 H0 g5 y; KThe physical examination revealed a very active,
: _% f$ P8 ^7 ?& V8 g4 [ Z2 Oplayful, and healthy boy. The vital signs documented# b2 J, J5 F: c- n" D, t* q
a blood pressure of 85/50 mm Hg, his length was
$ O$ X0 K1 L ]7 e90 cm (>97th percentile), and his weight was 14.4 kg
) N# h/ U% q& S+ o# U, E(also >97th percentile). The observed yearly growth, u A9 ]* a0 R# i
velocity was 30 cm (12 inches). The examination of
8 H( \& a5 v1 Dthe neck revealed no thyroid enlargement.
( @, N' G# d+ ~# GThe genitourinary examination was remarkable for
7 ?- Z5 W6 Z' Y, j2 w, g# Eenlargement of the penis, with a stretched length of
3 N; y8 X: @+ w8 cm and a width of 2 cm. The glans penis was very well1 U6 y7 j8 k- S3 q
developed. The pubic hair was Tanner II, mostly around0 N0 O6 x( g3 D% l
5407 J$ I; A/ n8 v* C0 h8 r
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
. H: l; Z: I9 Qthe base of the phallus and was dark and curled. The4 }& Y* _, A/ i$ Z
testicular volume was prepubertal at 2 mL each.
8 @! m# V$ p. xThe skin was moist and smooth and somewhat
5 ]4 F! r# O4 V' z/ k7 w" Loily. No axillary hair was noted. There were no
- H* p; C. ~/ R' Z8 D9 C+ t3 Wabnormal skin pigmentations or café-au-lait spots.& p5 t6 X/ x) o) P2 m
Neurologic evaluation showed deep tendon reflex 2+$ T5 B, V# \, W+ }0 t/ j8 i
bilateral and symmetrical. There was no suggestion
# C0 [/ j s9 Y- q- Xof papilledema.& T: [# F8 P a# `' W, c( i' N
Laboratory Evaluation" y$ X( D% V: |9 z
The bone age was consistent with 28 months by: a" t, [7 q: m* l
using the standard of Greulich and Pyle at a chrono-
7 k& Z1 W2 D4 d! C& ]' Mlogic age of 16 months (advanced).5 Chromosomal& P) J C* z( t+ s5 f# |. x4 y
karyotype was 46XY. The thyroid function test
4 k. f* C3 `7 T* H3 Nshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
1 g& I% \2 k* slating hormone level was 1.3 µIU/mL (both normal).! H7 e# ?2 p: R- Q
The concentrations of serum electrolytes, blood6 Y4 W/ N" w; F9 S
urea nitrogen, creatinine, and calcium all were
$ m# G3 }9 a2 `* S; h0 u3 Rwithin normal range for his age. The concentration
- l2 {( B! @4 ]) Zof serum 17-hydroxyprogesterone was 16 ng/dL
' x7 o9 y2 H; m- ?" B# z# D(normal, 3 to 90 ng/dL), androstenedione was 20" Q: ^" z1 G5 Y5 Z% R) v$ Y1 I
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-1 }0 Q n- Z; w! u( r
terone was 38 ng/dL (normal, 50 to 760 ng/dL),- Y8 Q9 V; ]8 J9 |; @# t5 G9 |8 L
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
. F6 V$ a. N' }5 s& p! L49ng/dL), 11-desoxycortisol (specific compound S)# P+ L2 Q" X$ N" D! |7 g! _$ F
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-1 Z" d' M* w2 S T7 [
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
2 F4 x& R; i8 Etestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
3 h$ |+ ^ L) Dand β-human chorionic gonadotropin was less than
l4 x' U# D' a. i# U8 o0 }3 D5 mIU/mL (normal <5 mIU/mL). Serum follicular1 g1 ^0 ~/ j6 u( T. {3 z
stimulating hormone and leuteinizing hormone
! C0 v' P5 U1 U$ Z2 Mconcentrations were less than 0.05 mIU/mL% u6 i( N: z' ^
(prepubertal).
1 R# f8 Q, y# M" `$ K. PThe parents were notified about the laboratory" |4 o; V; N9 U! Q
results and were informed that all of the tests were
8 g: h. s# l# [8 Tnormal except the testosterone level was high. The
1 K) g3 j8 u6 V2 y+ T4 l" d) Ffollow-up visit was arranged within a few weeks to
) n7 [& j* G3 i2 l+ b2 L" Zobtain testicular and abdominal sonograms; how-: y% [; Y( \8 `% ~3 V \) p
ever, the family did not return for 4 months.
9 D/ C1 D5 l) x0 `1 D" q, A n, MPhysical examination at this time revealed that the! _( e( p+ {6 p! R6 R
child had grown 2.5 cm in 4 months and had gained
3 b0 R8 y8 _1 u! h/ ?: o6 o2 kg of weight. Physical examination remained
8 ]: |5 Q8 ^8 v& Cunchanged. Surprisingly, the pubic hair almost com-7 y4 I- P2 N- }) u& u* j9 h9 C
pletely disappeared except for a few vellous hairs at% J4 ], k% g6 ?3 T$ d# o6 e7 f0 F: @
the base of the phallus. Testicular volume was still 2 b8 ~+ Z1 O. n1 ]
mL, and the size of the penis remained unchanged.+ g; @1 B8 I g( b$ P: ^/ H
The mother also said that the boy was no longer hav-
' L% m, k- W; _- L n2 [ing frequent erections.' ~. [5 Q* O6 L8 R- o& s, e
Both parents were again questioned about use of
6 ]. L% z% i7 Yany ointment/creams that they may have applied to7 c4 ?0 V: Q; b- `! U( {$ _, ]3 P
the child’s skin. This time the father admitted the
. ~/ S9 [; f: Y9 W% mTopical Testosterone Exposure / Bhowmick et al 541- B9 P3 p2 C2 n! {4 m$ t
use of testosterone gel twice daily that he was apply-
3 y6 P: V. v- ?! i& n1 r0 cing over his own shoulders, chest, and back area for! z4 Z# {4 X: ], p
a year. The father also revealed he was embarrassed0 B' e7 d: G- n1 T5 C8 D" b
to disclose that he was using a testosterone gel pre-
2 P; x6 P+ Y/ Q- @- w4 p+ t5 Y* p- [3 kscribed by his family physician for decreased libido) B0 Q3 E9 N: U5 u# ^3 I/ ^) s
secondary to depression.
: B* c6 P- z! Z9 V KThe child slept in the same bed with parents." j; X0 c l$ v
The father would hug the baby and hold him on his4 ~7 x# P, C( E; x; _) {
chest for a considerable period of time, causing sig-
: e* W, r1 P7 fnificant bare skin contact between baby and father.
6 y( z1 V) B3 A4 n4 } xThe father also admitted that after the phone call,( D/ e" H x, u7 @* \
when he learned the testosterone level in the baby
, U4 ~- Y7 X2 O4 Hwas high, he then read the product information
4 d* I3 u3 c, f9 D2 [packet and concluded that it was most likely the rea-, ~% _- A$ ^( A4 Y( D* A
son for the child’s virilization. At that time, they+ N: r: V1 H+ `$ r# P2 w9 q
decided to put the baby in a separate bed, and the! a8 T8 ` v7 I
father was not hugging him with bare skin and had
. U% N: B1 U& ] r+ u2 U) Bbeen using protective clothing. A repeat testosterone
( k/ U; l' ~' S! ]' L ptest was ordered, but the family did not go to the
* a3 V$ g7 t- Z2 T5 H, Dlaboratory to obtain the test.; B# @% P( X' W9 U$ m
Discussion
x7 G$ z* g% Y u l3 _( qPrecocious puberty in boys is defined as secondary& r9 z9 k1 S) o/ @
sexual development before 9 years of age.1,4* H: u3 f) W9 B6 E
Precocious puberty is termed as central (true) when
2 E1 u8 e, m5 w7 vit is caused by the premature activation of hypo-3 u7 E5 |/ s) F* O
thalamic pituitary gonadal axis. CPP is more com-
% U0 X3 W. b4 J2 A8 W6 W( i5 r) b" Jmon in girls than in boys.1,3 Most boys with CPP
! J* O& ~- d8 fmay have a central nervous system lesion that is# h) n) v$ C3 s2 x8 n( }9 Z
responsible for the early activation of the hypothal-
# ?- a2 F0 V% D0 c! t8 Jamic pituitary gonadal axis.1-3 Thus, greater empha-4 n# b2 M0 N: W2 |0 D8 q
sis has been given to neuroradiologic imaging in
* r& Q& l( N* X9 Y4 _+ Xboys with precocious puberty. In addition to viril-
3 N. A J- O4 Z! c) o3 K- Lization, the clinical hallmark of CPP is the symmet-5 A" _0 v, l8 ~, X' N8 }
rical testicular growth secondary to stimulation by& q( s. V/ r9 U- B6 W
gonadotropins.1,3
: R% o: d! x" H5 C! aGonadotropin-independent peripheral preco-
* E6 Q" c; i) E4 ucious puberty in boys also results from inappropriate8 S( D0 f% n: \! d! q; g2 [
androgenic stimulation from either endogenous or
9 p0 f2 Z& Y0 mexogenous sources, nonpituitary gonadotropin stim-8 A) C$ U5 I- W |- x) S
ulation, and rare activating mutations.3 Virilizing, i+ }7 e5 d2 y) a: H( W
congenital adrenal hyperplasia producing excessive/ r0 P* N/ [! j
adrenal androgens is a common cause of precocious2 N# o8 d7 u( A' I
puberty in boys.3,4
m8 j* Q5 m' w& m+ H WThe most common form of congenital adrenal
1 M: v* r4 F" Q1 N8 e `hyperplasia is the 21-hydroxylase enzyme deficiency.
% G* Y- A1 m. H$ `* |+ l! F# P( sThe 11-β hydroxylase deficiency may also result in
0 D# m% I" V9 L. \excessive adrenal androgen production, and rarely,1 X3 Z: A8 I/ Q, n* `! D8 B
an adrenal tumor may also cause adrenal androgen8 n7 U) q& g& v: X9 S' z' ^( D
excess.1,3
* ^* C. @! b, F& z* ]at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
( S) x' F0 S6 i$ ]. Z) s" U+ m9 z, u3 g542 Clinical Pediatrics / Vol. 46, No. 6, July 2007' u' V* y# B5 W4 _
A unique entity of male-limited gonadotropin-- B5 t) _3 ]# ^! k- ^( a
independent precocious puberty, which is also known
: N5 X( n6 w( [6 e) S: `, sas testotoxicosis, may cause precocious puberty at a
# b' _' T8 R+ v3 f# ~6 {very young age. The physical findings in these boys
2 g# [3 s# T- ^5 H8 ywith this disorder are full pubertal development,
; j2 w ?+ `( {/ H1 q, Bincluding bilateral testicular growth, similar to boys/ k3 I' k; G6 f. c
with CPP. The gonadotropin levels in this disorder/ ?5 ?/ ^# E0 {$ M
are suppressed to prepubertal levels and do not show2 W9 A% h& M1 p' {9 Q
pubertal response of gonadotropin after gonadotropin-7 R* }8 v* d4 l1 m9 A+ H$ F) G
releasing hormone stimulation. This is a sex-linked
% v: |& g2 T4 X. R$ |6 t9 s- @autosomal dominant disorder that affects only9 V" N4 i0 c6 g _1 W1 V8 O
males; therefore, other male members of the family/ [% M0 ^* h/ i; i) N; Q* J6 G
may have similar precocious puberty.33 K5 }1 o5 K0 Y
In our patient, physical examination was incon-
$ G$ ]% a3 Z: c6 H, r% X5 Rsistent with true precocious puberty since his testi-
! y9 r4 g! K7 `( B, Ocles were prepubertal in size. However, testotoxicosis
5 r/ C q6 a0 r9 w1 ^4 p2 B; Qwas in the differential diagnosis because his father" ~6 P& P! C- ^
started puberty somewhat early, and occasionally,/ Q; N* t. a3 ?6 `
testicular enlargement is not that evident in the# V# ]' A: L! X# i3 G& W+ _
beginning of this process.1 In the absence of a neg-# X2 K" l8 o; L1 t4 D+ \
ative initial history of androgen exposure, our
1 E7 l# o9 |: qbiggest concern was virilizing adrenal hyperplasia,/ L* Q2 ~' Z/ `, h
either 21-hydroxylase deficiency or 11-β hydroxylase
- s& l# Y6 z# K8 ~, r+ s! O+ ndeficiency. Those diagnoses were excluded by find-
( f: ~6 }* v& {( K5 M/ l; ring the normal level of adrenal steroids.7 p! e8 J' ]& L% G2 \4 K9 G) P
The diagnosis of exogenous androgens was strongly
9 J. O% g2 z; d- @suspected in a follow-up visit after 4 months because
; }2 @& f& m# L6 @* }; Q9 j0 athe physical examination revealed the complete disap-
( h7 P4 i4 v' H# l1 t, ]& Xpearance of pubic hair, normal growth velocity, and4 ^" [/ c) Z) m$ K
decreased erections. The father admitted using a testos-
C9 F% v+ n' _) ]6 s/ Mterone gel, which he concealed at first visit. He was9 P. f, N2 G5 d4 D
using it rather frequently, twice a day. The Physicians’, W# g) x7 M) }+ ` V4 u, \! _
Desk Reference, or package insert of this product, gel or
' E/ Z1 H; o8 Q0 X* h: Xcream, cautions about dermal testosterone transfer to# m" X1 Z; k3 R
unprotected females through direct skin exposure.
' v; }. }* q, a7 xSerum testosterone level was found to be 2 times the
& O% j1 u0 L1 @% j/ o7 e# T1 ~baseline value in those females who were exposed to
% |5 n5 P% r# `5 k& feven 15 minutes of direct skin contact with their male1 d8 ?; d+ u9 e' y
partners.6 However, when a shirt covered the applica-
1 _1 v: J( X* {+ i( _6 ktion site, this testosterone transfer was prevented.3 e/ J" ]! g" a! }
Our patient’s testosterone level was 60 ng/mL,9 N! H( T3 e$ C4 K
which was clearly high. Some studies suggest that
) q, p, n: j9 Z* p! `dermal conversion of testosterone to dihydrotestos-
' }2 S- L. V, b. x$ vterone, which is a more potent metabolite, is more% L- s4 x; I# h
active in young children exposed to testosterone# K( G1 p$ @' e% C2 r/ l. |; N
exogenously7; however, we did not measure a dihy-3 B1 o( }) U( @5 K2 Y+ z& ~
drotestosterone level in our patient. In addition to
& Q4 y+ p. n M8 N: V6 C- j! l' Pvirilization, exposure to exogenous testosterone in* B6 Q' _. t; c/ }: V1 b4 S' P4 P8 J
children results in an increase in growth velocity and
" \. T/ j1 M& B( S3 f$ Tadvanced bone age, as seen in our patient.: f1 f9 m& O" w3 v+ z1 |
The long-term effect of androgen exposure during
0 m0 p) ~* `4 a, gearly childhood on pubertal development and final
8 b5 ]8 n/ b+ e4 ladult height are not fully known and always remain
! E" G0 Z. d6 U' ~( Ea concern. Children treated with short-term testos-
9 s% s7 }6 H) [9 I9 Tterone injection or topical androgen may exhibit some" ]0 I _# r' E' j( \( l" y
acceleration of the skeletal maturation; however, after
7 w8 k3 \9 ^3 i( s& Zcessation of treatment, the rate of bone maturation9 f0 L- k) ?9 s0 f& {
decelerates and gradually returns to normal.8,9
3 w: u) m! D/ [) LThere are conflicting reports and controversy
5 Z; p7 o s" k/ W: y8 K1 G# C: hover the effect of early androgen exposure on adult
9 ^5 [5 [. [/ Wpenile length.10,11 Some reports suggest subnormal
! o& b# l" R7 G% S6 Badult penile length, apparently because of downreg-
, N7 |1 W# Q8 Wulation of androgen receptor number.10,12 However,
8 u. f* f! S6 k! K1 BSutherland et al13 did not find a correlation between! { Q( P! s C* x0 S
childhood testosterone exposure and reduced adult% |' V, ^" Y. [; ?5 T2 `
penile length in clinical studies.0 h4 ~- e+ z# f" Z+ D9 Z: p/ ~
Nonetheless, we do not believe our patient is
& o, N1 p) \' v2 kgoing to experience any of the untoward effects from
! b9 B& d0 \7 u$ @testosterone exposure as mentioned earlier because# K9 u* z* o# R3 e3 n/ P$ K2 S6 v
the exposure was not for a prolonged period of time.1 U4 R: Q3 S/ J4 U+ _
Although the bone age was advanced at the time of; {5 Q; e2 z! s" x }2 K
diagnosis, the child had a normal growth velocity at
! L; S: w7 e! g5 \( f( ^8 Qthe follow-up visit. It is hoped that his final adult9 `- K/ {. ?& |6 v7 F, `6 I Z
height will not be affected., X& K6 n- l0 i
Although rarely reported, the widespread avail-
4 P r% q0 Z/ M, d1 \ability of androgen products in our society may
0 T3 H$ p8 t# T6 `& mindeed cause more virilization in male or female; B/ f5 S X# w* O& H' K9 k
children than one would realize. Exposure to andro-% e# H6 R$ L% V6 ~5 ?6 I2 N$ _
gen products must be considered and specific ques-# Q( Y( }' Z5 M: C$ c# D8 p
tioning about the use of a testosterone product or
1 l1 k7 W& X4 ^! ?' P5 X0 c3 ygel should be asked of the family members during; U" ]3 B0 r1 `0 W% n9 v5 U
the evaluation of any children who present with vir-
/ G6 J5 b: t- @" a! y- iilization or peripheral precocious puberty. The diag-3 @; h" |0 p$ C
nosis can be established by just a few tests and by
- W }: f- W! mappropriate history. The inability to obtain such a
+ {; A# N0 Q+ h" J" ?history, or failure to ask the specific questions, may
! V. U' ?; g6 m8 \2 R- Aresult in extensive, unnecessary, and expensive1 ]1 D: r- g$ _9 z, ~7 I: E- y
investigation. The primary care physician should be
! u& D7 ?+ ^1 @4 V4 V& h8 Laware of this fact, because most of these children! c, {8 }7 b) Q1 [$ L3 e
may initially present in their practice. The Physicians’$ Y' ?, i, P9 `& ^6 T) [
Desk Reference and package insert should also put a
9 w2 z+ B3 x3 v0 S0 }warning about the virilizing effect on a male or
4 B) p* w8 x. h! O5 ?+ j/ gfemale child who might come in contact with some-
. m7 m) ~6 G2 f3 y- H: x+ uone using any of these products.9 c: U7 U8 ]. ?4 v5 ^& n* h: H- D
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